WASHINGTON -- Jacob Nix, the Astros' fifth-round Draft pick this year, who was considered to be a tough signing based on his commitment to UCLA, told MLB.com on Tuesday that he had agreed to a deal to join the Astros. He said he would be in Houston next week to sign his contract, take a physical and have a news conference.

MLB.com's Jim Callis reported that Nix agreed to a $1.5 million signing bonus, which is well above the assigned slot value of $370,500 for the 136th overall pick. The Astros had not announced the deal.

"It's a dream come true," Nix told MLB.com. "It's pretty crazy we were able to come to an agreement in the fifth round."

Nix is a 6-foot-3 right-handed pitcher from Los Alamitos High School in California. He pitched on Team USA's under-18 gold-medal-winning team in 2013. Also on the team was Brady Aiken, whom the Astros selected with the No 1. overall pick, and the two are friends.

"After not being drafted on the first day I was expecting to go to school, and we ended up sorting out a better deal in the fifth round," Nix said. "I had my dollar figure, and if I got my dollar figure I'd turn pro, and if it were a dollar less I was going to college. It was a fairly easy decision."

Nix said he would report to Kissimmee, Fla., next week to begin his pro career.